Common Weakness Enumeration
CWE-208
AllowedObservable Timing Discrepancy
Abstraction: Base · Status: Incomplete
Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.
392 vulnerabilities reference this CWE, most recent first.
CVE-2026-15041 (GCVE-0-2026-15041)
Vulnerability from cvelistv5 – Published: 2026-07-08 10:15 – Updated: 2026-07-08 13:44
VLAI
EPSS
VEX
Title
389-ds-base: 389-ds-base: non-constant-time comparison in pbkdf2-sha256 password verification
Summary
A flaw was found in 389 Directory Server. The PBKDF2-SHA256 password verification function uses standard memcmp() for comparing password hashes instead of a constant-time comparison function. A remote attacker could potentially use timing measurements of LDAP bind attempts to infer partial hash information, though practical exploitation is extremely difficult due to PBKDF2 computational overhead.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 13:44 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-15041 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2498022 | issue-trackingx_refsource_REDHAT |
Impacted products
8 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Directory Server 11 |
cpe:/a:redhat:directory_server:11
|
|
| Red Hat | Red Hat Directory Server 12 |
cpe:/a:redhat:directory_server:12
|
|
| Red Hat | Red Hat Directory Server 13 |
cpe:/a:redhat:directory_server:13
|
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
Date Public
2026-07-08 09:58
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CVE-2026-13758 (GCVE-0-2026-13758)
Vulnerability from cvelistv5 – Published: 2026-06-29 20:42 – Updated: 2026-06-30 13:56
VLAI
EPSS
VEX
Title
CryptX versions before 0.088_001 for Perl compare AEAD authentication tags in non-constant time in the streaming decrypt_done path
Summary
CryptX versions before 0.088_001 for Perl compare AEAD authentication tags in non-constant time in the streaming decrypt_done path.
The decrypt_done($tag) form compares it against the computed tag with memNE (memcmp() != 0), which short-circuits on the first differing byte, so its run time depends on the number of matching leading bytes. This affects all five AEAD modes: GCM, CCM, ChaCha20Poly1305, EAX and OCB. The one-shot *_decrypt_verify helpers are unaffected; they verify the tag inside libtomcrypt with a constant-time comparison.
The timing difference is a tag-verification oracle. An attacker who can submit many candidate tags for the same nonce, ciphertext and associated data while measuring the timing precisely enough may recover the expected tag byte by byte and forge a message that verifies.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-30 13:56 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
3 references
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CVE-2026-13183 (GCVE-0-2026-13183)
Vulnerability from cvelistv5 – Published: 2026-07-22 13:36 – Updated: 2026-07-22 19:15
VLAI
EPSS
VEX
Title
RadAsyncUpload Upload Metadata Timing Oracle Vulnerability in Telerik UI for ASP.NET AJAX
Summary
In Progress® Telerik® UI for AJAX prior to v2026.2.708, RadAsyncUpload upload metadata processing may leak cryptographic validity through measurable timing differences, enabling remote attackers to recover protected metadata values.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-22 19:14 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.telerik.com/products/aspnet-ajax/docu… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Progress Software | Telerik UI for ASP.NET AJAX |
Affected:
2010.1.309 , < 2026.2.708
(custom)
|
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CVE-2026-9537 (GCVE-0-2026-9537)
Vulnerability from cvelistv5 – Published: 2026-07-17 15:29 – Updated: 2026-07-20 19:37
VLAI
EPSS
VEX
Title
Mojo::JWT versions before 1.02 for Perl verify HMAC signatures with a non-constant-time string comparison
Summary
Mojo::JWT versions before 1.02 for Perl verify HMAC signatures with a non-constant-time string comparison.
The decode() method compares the supplied signature to the recomputed HMAC with Perl's eq operator, which stops at the first differing byte, so the comparison time varies with the number of matching leading bytes.
A caller that decodes attacker supplied tokens leaks the expected signature through this timing variation, which can be aggregated over many requests to recover the signature and forge a token.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 19:37 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
2 references
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CVE-2026-8794 (GCVE-0-2026-8794)
Vulnerability from cvelistv5 – Published: 2026-08-03 07:02 – Updated: 2026-08-03 14:30
VLAI
EPSS
VEX
Title
PaperCut NG/MF: User enumeration via timing attack
Summary
PaperCut NG/MF contains an observable timing discrepancy in its authentication component. An unauthenticated remote attacker can exploit this vulnerability to perform username enumeration by measuring response times during login attempts. The system executes a password hash comparison only when a valid account is supplied, creating a measurable timing oracle that reveals account existence.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-03 14:29 UTC
CWE
- CWE-208 - Observable timing discrepancy
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| PaperCut | PaperCut NG/MF |
Affected:
0 , < 26.0.3
(semver)
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CVE-2026-6656 (GCVE-0-2026-6656)
Vulnerability from cvelistv5 – Published: 2026-07-20 07:01 – Updated: 2026-07-20 18:38
VLAI
EPSS
VEX
Title
Crypt::Password versions through 0.28 for Perl are susceptible to timing attacks
Summary
Crypt::Password versions through 0.28 for Perl are susceptible to timing attacks.
The check_password method uses the built-in eq operator. This allows discrepancies in timing to be used to guess the underlying hash.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 13:06 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
3 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| DRSTEVE | Crypt::Password |
Affected:
0 , ≤ 0.28
(custom)
|
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CVE-2026-6291 (GCVE-0-2026-6291)
Vulnerability from cvelistv5 – Published: 2026-06-25 16:41 – Updated: 2026-06-25 17:59
VLAI
EPSS
VEX
Title
Bleichenbacher padding oracle in PKCS#7 KTRI RSA PKCS#1 v1.5 decryption
Summary
Bleichenbacher padding oracle in PKCS#7 KTRI decryption. When decrypting PKCS#7 EnvelopedData using RSA PKCS#1 v1.5 key transport, wolfSSL returned distinguishable error codes depending on whether RSA padding validation failed versus whether the decrypted content was malformed. An attacker able to submit crafted EnvelopedData messages and observe error responses could use this as a padding oracle to incrementally recover the encrypted Content Encryption Key (CEK). The fix generates a deterministic pseudo-random fake CEK on padding failure (via HMAC-SHA256) and proceeds with decryption identically, using constant-time operations throughout, so that all failure paths produce the same error regardless of padding validity.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-25 17:59 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
2 references
Impacted products
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CVE-2026-5419 (GCVE-0-2026-5419)
Vulnerability from cvelistv5 – Published: 2026-06-01 19:26 – Updated: 2026-10-02 02:27
VLAI
EPSS
VEX
Title
Gnutls: gnutls: information disclosure via timing side-channel in pkcs#7 padding removal
Summary
A flaw was found in gnutls. The PKCS#7 padding check, performed during decryption, was not constant-time. This timing side-channel could allow a remote attacker to potentially leak sensitive information about the padding bytes through observable timing differences. This vulnerability is a form of information disclosure.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-02 12:35 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
14 references
Impacted products
22 products
| Vendor | Product | Version | |
|---|---|---|---|
|
Affected:
0
|
|||
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:3.8.10-4.el10_2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
Unaffected:
0:3.8.9-9.el10_0.19 , < *
(rpm)
cpe:/o:redhat:enterprise_linux_eus:10.0 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:3.8.10-4.el9_8 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/o:redhat:enterprise_linux:9::baseos |
|
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions |
Unaffected:
0:3.8.3-4.el9_4.6 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.4::appstream cpe:/o:redhat:rhel_e4s:9.4::baseos |
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:3.8.3-6.el9_6.4 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6::appstream cpe:/o:redhat:rhel_eus:9.6::baseos |
|
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.20 |
Unaffected:
1790598593 , < *
(rpm)
cpe:/a:redhat:cert_manager:1.20::el9 |
|
| Red Hat | Red Hat Discovery 2 |
Unaffected:
1782159791 , < *
(rpm)
cpe:/a:redhat:discovery:2::el9 |
|
| Red Hat | Red Hat Discovery 2 |
Unaffected:
1782166952 , < *
(rpm)
cpe:/a:redhat:discovery:2::el9 |
|
| Red Hat | Red Hat Hardened Images |
Unaffected:
3.8.13-1.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat OpenShift AI 3.4 |
Unaffected:
1790703542 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.4::el9 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1781525684 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1781525671 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1781525693 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1781525739 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1787241211 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1787135742 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1787241260 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4
|
Date Public
2026-04-29 00:00
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CVE-2026-5091 (GCVE-0-2026-5091)
Vulnerability from cvelistv5 – Published: 2026-05-21 21:07 – Updated: 2026-05-22 14:13
VLAI
EPSS
VEX
Title
Catalyst::Plugin::Authentication versions through 0.10024 for Perl is susceptible to timing attacks
Summary
Catalyst::Plugin::Authentication versions through 0.10024 for Perl is susceptible to timing attacks.
These versions use Perl's built-in eq comparison. Discrepencies in timing could be used to guess the underlying hash or password.
Severity
5.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-22 14:13 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
3 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| JJNAPIORK | Catalyst::Plugin::Authentication |
Affected:
0 , ≤ 0.10024
(custom)
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CVE-2026-5086 (GCVE-0-2026-5086)
Vulnerability from cvelistv5 – Published: 2026-04-13 22:54 – Updated: 2026-04-15 20:03
VLAI
EPSS
VEX
Title
Crypt::SecretBuffer versions before 0.019 for Perl is suseceptible to timing attacks
Summary
Crypt::SecretBuffer versions before 0.019 for Perl is suseceptible to timing attacks.
For example, if Crypt::SecretBuffer was used to store and compare plaintext passwords, then discrepencies in timing could be used to guess the secret password.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-15 19:59 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| NERDVANA | Crypt::SecretBuffer |
Affected:
0 , < 0.019
(custom)
|
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"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-5086",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-15T19:59:41.270630Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-15T20:03:28.442Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://cpan.org/modules",
"defaultStatus": "unaffected",
"packageName": "Crypt-SecretBuffer",
"product": "Crypt::SecretBuffer",
"programFiles": [
"SecretBuffer.xs"
],
"programRoutines": [
{
"name": "Crypt::SecretBuffer::memcmp"
}
],
"repo": "https://github.com/nrdvana/perl-Crypt-SecretBuffer",
"vendor": "NERDVANA",
"versions": [
{
"lessThan": "0.019",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Crypt::SecretBuffer versions before 0.019 for Perl is suseceptible to timing attacks.\n\nFor example, if Crypt::SecretBuffer was used to store and compare plaintext passwords, then discrepencies in timing could be used to guess the secret password."
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-208",
"description": "CWE-208 Observable Timing Discrepancy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-13T22:54:53.724Z",
"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
"shortName": "CPANSec"
},
"references": [
{
"tags": [
"release-notes"
],
"url": "https://metacpan.org/release/NERDVANA/Crypt-SecretBuffer-0.019/source/Changes"
}
],
"solutions": [
{
"lang": "en",
"value": "Upgrade to version 0.019 or later."
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Crypt::SecretBuffer versions before 0.019 for Perl is suseceptible to timing attacks",
"x_generator": {
"engine": "cpansec-cna-tool 0.1"
}
}
},
"cveMetadata": {
"assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
"assignerShortName": "CPANSec",
"cveId": "CVE-2026-5086",
"datePublished": "2026-04-13T22:54:53.724Z",
"dateReserved": "2026-03-28T19:22:27.564Z",
"dateUpdated": "2026-04-15T20:03:28.442Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
No mitigation information available for this CWE.
CAPEC-462: Cross-Domain Search Timing
An attacker initiates cross domain HTTP / GET requests and times the server responses. The timing of these responses may leak important information on what is happening on the server. Browser's same origin policy prevents the attacker from directly reading the server responses (in the absence of any other weaknesses), but does not prevent the attacker from timing the responses to requests that the attacker issued cross domain.
CAPEC-541: Application Fingerprinting
An adversary engages in fingerprinting activities to determine the type or version of an application installed on a remote target.
CAPEC-580: System Footprinting
An adversary engages in active probing and exploration activities to determine security information about a remote target system. Often times adversaries will rely on remote applications that can be probed for system configurations.