🛡️ CVE-2025-1734 on Debian — php7.4

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

In PHP from 8.1.* before 8.1.32, from 8.2.* before 8.2.28, from 8.3.* before 8.3.19, from 8.4.* before 8.4.5, when receiving headers from HTTP server, the headers missing a colon (:) are treated as valid headers even though they are not. This may confuse applications into accepting invalid headers.

Distribution advisory

This page covers CVE-2025-1734 as tracked by Debian, for the package php7.4. The fix is available in version 7.4.33-1+deb11u8; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity low, availability none.

Affected software

DEBIAN-CVE-2025-1734 is recorded against 3 packages.

php7.4 (fixed in 7.4.33-1+deb11u8)
php8.2 (fixed in 8.2.28-1~deb12u1)
php8.4 (fixed in 8.4.5-1)

Timeline and source

Published on 30 March 2025 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2025-1734 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

BellSoft Base record Ubuntu

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2025-03-30

Updated 2026-08-20

Modified 2026-08-04

Fix URL N/A

Affected Packages

Software	From version	Fixed in
php7.4	—	7.4.33-1+deb11u8
php8.2	—	8.2.28-1~deb12u1
php8.4	—	8.4.5-1

References

ADVISORY https://security-tracker.debian.org/tracker/CVE-2025-1734

🔗 NVD 🔗 Mitre

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