Common Weakness Enumeration

CWE-208

Allowed

Observable Timing Discrepancy

Abstraction: Base · Status: Incomplete

API response cwe.mitre.org

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.

401 vulnerabilities reference this CWE, most recent first.

CVE-2026-23996 (GCVE-0-2026-23996)

Vulnerability from cvelistv5 – Published: 2026-01-21 22:29 – Updated: 2026-01-22 16:49
VLAI
Title
FastAPI Api Key has a timing side-channel in verify_key that allows statistical key validity detection
Summary
FastAPI Api Key provides a backend-agnostic library that provides an API key system. Version 1.1.0 has a timing side-channel vulnerability in verify_key(). The method applied a random delay only on verification failures, allowing an attacker to statistically distinguish valid from invalid API keys by measuring response latencies. With enough repeated requests, an adversary could infer whether a key_id corresponds to a valid key, potentially accelerating brute-force or enumeration attacks. All users relying on verify_key() for API key authentication prior to the fix are affected. Users should upgrade to version 1.1.0 to receive a patch. The patch applies a uniform random delay (min_delay to max_delay) to all responses regardless of outcome, eliminating the timing correlation. Some workarounds are available. Add an application-level fixed delay or random jitter to all authentication responses (success and failure) before the fix is applied and/or use rate limiting to reduce the feasibility of statistical timing attacks.
Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-22 15:09 UTC
CWE
  • CWE-208 - Observable Timing Discrepancy
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7730 records in the last 180 days details
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-23901 (GCVE-0-2026-23901)

Vulnerability from cvelistv5 – Published: 2026-02-10 09:25 – Updated: 2026-02-10 15:31
VLAI
Title
Apache Shiro: Brute force attack possible to determine valid user names
Summary
Observable Timing Discrepancy vulnerability in Apache Shiro. This issue affects Apache Shiro: from 1.*, 2.* before 2.0.7. Users are recommended to upgrade to version 2.0.7 or later, which fixes the issue. Prior to Shiro 2.0.7, code paths for non-existent vs. existing users are different enough, that a brute-force attack may be able to tell, by timing the requests only, determine if the request failed because of a non-existent user vs. wrong password. The most likely attack vector is a local attack only. Shiro security model  https://shiro.apache.org/security-model.html#username_enumeration  discusses this as well. Typically, brute force attack can be mitigated at the infrastructure level.
Severity
1 (Low)
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:A/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/S:N/AU:Y/R:A/V:C/RE:L/U:Green
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-10 15:31 UTC
CWE
  • CWE-208 - Observable Timing Discrepancy
Assigner
apache CNA under the mitre root
CNA scorecard B 76/100 over 943 records in the last 180 days details
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache Shiro Affected: 0 , < 2.0.7 (semver)
Create a notification for this product.
Credits
4ra1n Y4tacker lprimak
Show details on NVD website
To clipboard 

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CVE-2026-23892 (GCVE-0-2026-23892)

Vulnerability from cvelistv5 – Published: 2026-01-27 18:35 – Updated: 2026-01-27 19:14
VLAI
Title
OctoPrint has Timing Side-Channel Vulnerability in API Key Authentication
Summary
OctoPrint provides a web interface for controlling consumer 3D printers. OctoPrint versions up to and including 1.11.5 are affected by a (theoretical) timing attack vulnerability that allows API key extraction over the network. Due to using character based comparison that short-circuits on the first mismatched character during API key validation, rather than a cryptographical method with static runtime regardless of the point of mismatch, an attacker with network based access to an affected OctoPrint could extract API keys valid on the instance by measuring the response times of the denied access responses and guess an API key character by character. The vulnerability is patched in version 1.11.6. The likelihood of this attack actually working is highly dependent on the network's latency, noise and similar parameters. An actual proof of concept was not achieved so far. Still, as always administrators are advised to not expose their OctoPrint instance on hostile networks, especially not on the public Internet.
Severity
6 (Medium)
CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-27 19:13 UTC
CWE
  • CWE-208 - Observable Timing Discrepancy
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7730 records in the last 180 days details
References
Impacted products
Vendor Product Version
OctoPrint OctoPrint Affected: < 1.11.6
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-23849 (GCVE-0-2026-23849)

Vulnerability from cvelistv5 – Published: 2026-01-19 20:37 – Updated: 2026-01-20 15:54
VLAI
Title
File Browser vulnerable to Username Enumeration via Timing Attack in /api/login
Summary
File Browser provides a file managing interface within a specified directory and can be used to upload, delete, preview, rename, and edit files. Prior to version 2.55.0, the JSONAuth. Auth function contains a logic flaw that allows unauthenticated attackers to enumerate valid usernames by measuring the response time of the /api/login endpoint. The vulnerability exists due to a "short-circuit" evaluation in the authentication logic. When a username is not found in the database, the function returns immediately. However, if the username does exist, the code proceeds to verify the password using bcrypt (users.CheckPwd), which is a computationally expensive operation designed to be slow. This difference in execution path creates a measurable timing discrepancy. Version 2.55.0 contains a patch for the issue.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-20 15:54 UTC
CWE
  • CWE-208 - Observable Timing Discrepancy
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7730 records in the last 180 days details
References
Impacted products
Vendor Product Version
filebrowser filebrowser Affected: < 2.55.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-23519 (GCVE-0-2026-23519)

Vulnerability from cvelistv5 – Published: 2026-01-15 19:13 – Updated: 2026-01-15 19:57
VLAI
Title
RustCrypto cmov: thumbv6m-none-eabi compiler emits non-constant time assembly when using cmovnz
Summary
RustCrypto CMOV provides conditional move CPU intrinsics which are guaranteed on major platforms to execute in constant-time and not be rewritten as branches by the compiler. Prior to 0.4.4, the thumbv6m-none-eabi (Cortex M0, M0+ and M1) compiler emits non-constant time assembly when using cmovnz (portable version). This vulnerability is fixed in 0.4.4.
Severity
8.9 (High)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-15 19:57 UTC
CWE
  • CWE-208 - Observable Timing Discrepancy
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7730 records in the last 180 days details
References
Impacted products
Vendor Product Version
RustCrypto utils Affected: < 0.4.4
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-21840 (GCVE-0-2026-21840)

Vulnerability from cvelistv5 – Published: 2026-07-14 21:36 – Updated: 2026-07-15 12:46
VLAI
Title
HCL BigFix Platform is affected by a user enumeration vulnerability
Summary
HCL BigFix Platform is affected by a user enumeration vulnerability which might allow an attacker, through careful system control and response time monitoring, to perform some level of user enumeration for the BigFix service.
Severity
3.1 (Low)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 12:45 UTC
CWE
  • CWE-208 - Observable timing discrepancy
Assigner
HCL CNA under the mitre root
CNA scorecard C 64/100 over 184 records in the last 180 days details
References
Impacted products
Vendor Product Version
HCLSoftware HCL BigFix Platform Affected: 10.0.0 - 10.0.15, 11.0.0 - 11.0.5
Create a notification for this product.
Date Public
2026-07-14 21:36
Show details on NVD website
To clipboard 

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CVE-2026-18259 (GCVE-0-2026-18259)

Vulnerability from cvelistv5 – Published: 2026-08-25 22:21 – Updated: 2026-08-26 18:42
VLAI
Title
Token Content Access - Moderately critical - Access bypass - SA-CONTRIB-2026-090
Summary
Observable Timing Discrepancy vulnerability in Drupal Token Content Access allows Brute Force. This issue affects Token Content Access versions: from 0.0.0 to 3.1.2.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 18:42 UTC
CWE
  • CWE-208 - Observable Timing Discrepancy
Assigner
drupal CNA under the mitre root
CNA scorecard D 52/100 over 103 records in the last 180 days details
References
Impacted products
Vendor Product Version
Drupal Token Content Access Affected: 0.0.0 , < 3.1.2 (semver)
Create a notification for this product.
Date Public
2026-07-29 17:08
Credits
Robin (robincs) Kyrylo Loboda (lobodakyrylo) Bram Driesen (bramdriesen) cilefen (cilefen) Greg Knaddison (greggles) Juraj Nemec (poker10) Swan Kalata (akalata)
Show details on NVD website
To clipboard 

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CVE-2026-18040 (GCVE-0-2026-18040)

Vulnerability from cvelistv5 – Published: 2026-10-03 08:55 – Updated: 2026-10-05 16:00
VLAI
Title
HQC leaks private key information through secret-indexed GF(2^8) tables and a secret-dependent fixed-weight sampler
Summary
In Bouncy Castle for Java before 1.86, HQC leaked secret-derived data through two side channels: its GF(2^8) arithmetic used lookup tables indexed by field elements, making the cache line touched a function of the operand, and its fixed-weight support sampler left its duplicate scan as soon as a collision was found and stored accepted positions at a secret index. Both run on secret inputs during encapsulation and decapsulation, and the sampler re-expands the secret key from its seed on every decapsulation, so an attacker able to observe cache behaviour or decapsulation timing can recover information about the HQC private key. The field arithmetic is now table-free and the sampler branch-free within a batch of candidates, with output and randomness consumption unchanged.
Severity
5.9 (Medium)
CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-05 16:00 UTC
CWE
  • CWE-208 - Observable Timing Discrepancy
Assigner
bcorg CNA under the mitre root
CNA scorecard B 84/100 over 74 records in the last 180 days details
References
Impacted products
Vendor Product Version
Legion of the Bouncy Castle Inc. BC-JAVA Affected: 1.73 , < 1.86 (maven)
Create a notification for this product.
Credits
The Robusta team: Deepak Bhargavan Pillai, Anirban Chakraborty, Chitchanok Chuengsatiansup, Matthew Roughan, Peter Schwabe, and Yuval Yarom
Show details on NVD website
To clipboard 

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CVE-2026-18036 (GCVE-0-2026-18036)

Vulnerability from cvelistv5 – Published: 2026-10-02 07:54 – Updated: 2026-10-02 17:42
VLAI
Title
NTRU leaks private key information by reducing secret values with a non-constant-time integer division
Summary
In Bouncy Castle for Java before 1.86, NTRU reduced secret values with the % operator in three helpers whose reference implementations are deliberately division-free, so each reduction was carried out by an integer division whose latency depends on the secret operand. Polynomial.modQ divided by a variable divisor, which a compiler cannot strength-reduce to a multiply the way it can a constant one, so it emitted a division on every call including on the decapsulation path where the dividend derives from the private key; Polynomial.mod3 and NTRUSampling.mod3 divided the secret key polynomials f and g during key generation, the message polynomials r and m during encapsulation, and coefficients recovered during decapsulation. An attacker able to measure that timing can recover information about the NTRU private key. modQ now masks, which is exact because q is always a power of two, and mod3 uses the reference implementation's division-free fold and select; the results are unchanged.
Severity
8.2 (High)
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 17:42 UTC
CWE
  • CWE-208 - Observable Timing Discrepancy
Assigner
bcorg CNA under the mitre root
CNA scorecard B 84/100 over 74 records in the last 180 days details
References
Impacted products
Vendor Product Version
Legion of the Bouncy Castle Inc. BC-JAVA Affected: 1.73 , < 1.86 (maven)
Create a notification for this product.
Credits
The Robusta team: Deepak Bhargavan Pillai, Anirban Chakraborty, Chitchanok Chuengsatiansup, Matthew Roughan, Peter Schwabe, and Yuval Yarom
Show details on NVD website
To clipboard 

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CVE-2026-16731 (GCVE-0-2026-16731)

Vulnerability from cvelistv5 – Published: 2026-08-06 13:14 – Updated: 2026-08-06 14:43
VLAI
Title
Authentication and authorization bypass via cryptographic timing side-channel attack in StationScout
Summary
OMICRON StationScout before version 3.05 contains a cryptographic timing side-channel vulnerability in the backend authentication mechanism that may allow an unauthenticated attacker to forge valid authentication credentials, bypass authentication and authorization, and impersonate legitimate clients. An attacker can gain full access to the system configuration, allowing modification, reset, or unauthorized alteration of system parameters or injecting network traffic into the connected network.
Severity
8.3 (High)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:H/E:U/S:P
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 14:43 UTC
CWE
  • CWE-208 - Observable timing discrepancy
Assigner
OMICRON CNA under the icscert root
CNA scorecard – unranked: 3 records in the last 180 days, 10 needed details
References
Impacted products
Vendor Product Version
OMICRON electronics GmbH OMICRON StationScout Affected: 0 , < 3.05 (semver)
    cpe:2.3:a:omicron_electronics_gmbh:omicron_stationscout:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-07-31 07:00
Show details on NVD website
To clipboard 

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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.

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