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CVE-2026-26275— httpsig-hyper has Improper Digest Verification that May Allow Message Integrity Bypass

Quick assessment

Affected
junkurihara httpsig-rs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

httpsig-rs是Jun Kurihara个人开发者的一个Rust库。 httpsig-rs 0.0.23之前版本存在安全漏洞，该漏洞源于Digest标头验证因误用matches!宏而可能错误地成功，可能导致无法检测消息正文修改。

CVSS 7.5 · High EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1565.003 · Runtime Data Manipulation
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I. Basic Information for CVE-2026-26275

Vulnerability Information
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Vulnerability Title
httpsig-hyper has Improper Digest Verification that May Allow Message Integrity Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
httpsig-hyper is a hyper extension for http message signatures. An issue was discovered in `httpsig-hyper` prior to version 0.0.23 where Digest header verification could incorrectly succeed due to misuse of Rust's `matches!` macro. Specifically, the comparison `if matches!(digest, _expected_digest)` treated `_expected_digest` as a pattern binding rather than a value comparison, resulting in unconditional success of the match expression. As a consequence, digest verification could incorrectly return success even when the computed digest did not match the expected value. Applications relying on Digest verification as part of HTTP message signature validation may therefore fail to detect message body modification. The severity depends on how the library is integrated and whether additional signature validation layers are enforced. This issue has been fixed in `httpsig-hyper` 0.0.23. The fix replaces the incorrect `matches!` usage with proper value comparison and additionally introduces constant-time comparison for digest verification as defense-in-depth. Regression tests have also been added to prevent reintroduction of this issue. Users are strongly advised to upgrade to the patched version. There is no reliable workaround without upgrading. Users who cannot immediately upgrade should avoid relying solely on Digest verification for message integrity and ensure that full HTTP message signature verification is enforced at the application layer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
完整性检查值验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
httpsig-rs 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
httpsig-rs是Jun Kurihara个人开发者的一个Rust库。 httpsig-rs 0.0.23之前版本存在安全漏洞，该漏洞源于Digest标头验证因误用matches!宏而可能错误地成功，可能导致无法检测消息正文修改。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
junkurihara httpsig-rs < 0.0.23 -

II. Public POCs for CVE-2026-26275

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III. Intelligence Information for CVE-2026-26275

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Vendor Advisories for CVE-2026-26275 (1)

IV. Related Vulnerabilities

Same product: httpsig-rs
Same vendor: junkurihara
Same weakness: CWE-354

V. Comments for CVE-2026-26275

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