DSA-6406-1 php8.4 - security update

unknownpublic exploitCVE-2026-7260 CVE-2026-17543 CVE-2026-17544

Multiple security issues were found in PHP, a widely-used open source general purpose scripting language, which could result in denial of service, SQL injection, information disclosure or the execution of arbitrary code. https://security-tracker.debian.org/tracker/DSA-6406-1

CSIRTS triage

vendor: PHP product: PHP Denial of service SQL injection Information disclosure Remote code executionaffected: 8.4

What: Multiple security issues in PHP allow denial of service, SQL injection, information disclosure, and arbitrary code execution.
Who is affected: Systems running PHP 8.4.
Urgency: High; arbitrary code execution is a critical risk.
Action: Upgrade PHP to the patched version referenced in DSA-6406-1.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Debian Security Advisories (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-07-31
Exploitation: Not in CISA KEV at last sync

Original advisory: https://lists.debian.org/debian-security-announce/2026/msg00317.html

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-72600.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-175430.32% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 25% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-175440.43% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 35% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-7260	coverage & exploitation status	NVD · CVE.org
CVE-2026-17543	coverage & exploitation status	NVD · CVE.org
CVE-2026-17544	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownUSN-8734-1: PHP vulnerabilitiesubuntu
high[UPDATE] [hoch] PHP: Mehrere Schwachstellencert-bund
unknownPHP Multiple Vulnerabilitieshkcert
unknownMultiple vulnerabilities in PHP (July 31, 2026)cert-fr-avis
mediumCVE-2026-7260: Circular symbolic links in phar archives could lead to unbounded recursion, exhausting the C st…nvd
criticalCVE-2026-17544: Attacker-provided inputs to bccomp() could lead to an out-of-bounds write with stack and heap …nvd
criticalCVE-2026-17543: Improper escaping of backslashes in attacker-provided parameters would allow for trivial SQL i…nvd
criticalCVE-2026-17543: SQL injection in ext-pgsql via E'...' backslash breakoutmsrc
mediumCVE-2026-7260: Stack overflow in phar with circular symlinksmsrc