CVE WatchJul 23, 2026

CVE-2026-34183

Issue summary: Remote peer may exhaust heap memory of the QUIC server or client by flooding it with packets containing PATH_CHALLENGE frames

CVSS

7.5

High

EPSS

1.0%

p61

KEV

—

Exploit Today

0-100

Published: Jun 9, 2026 · Last modified: Jul 23, 2026 · CWE-1325

EPSS · 30d

0.5%EPSS · 30 days1.0%

2026-07-012026-07-28

Technical description

Issue summary: Remote peer may exhaust heap memory of the QUIC server or client by flooding it with packets containing PATH_CHALLENGE frames. Impact summary: A malicious remote peer can cause an unbounded memory allocation which can lead to an abnormal termination of the application acting as a QUIC client or server and a Denial of Service. A remote peer may exhaust heap memory by flooding the local QUIC stack with PATH_CHALLENGE frames. The local QUIC stack allocates a PATH_RESPONSE frame for every PATH_CHALLENGE it receives. The allocated PATH_RESPONSE frame gets freed only when the remote peer acknowledges reception of the PATH_RESPONSE frame which will not be done by a malicious peer. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue. The QUIC stack is outside of OpenSSL FIPS module boundary.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

CVE-2026-54081—

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———veraPDF PDF parser is a PDF parser for veraPDF. Prior to 1.30.2 and 1.31.23, veraPDF-parser contains a denial-of-service vulnerability in veraPDF-parser/src/main/java/org/verapdf/pd/font/type1/Type1FontProgram.java and veraPDF-parser/src/main/java/org/verapdf/parser/postscript/PSOperator.java, where a crafted Type 1 font /FontDescriptor /FontFile program can execute unbounded PostScript array allocation, a zero-increment for loop, or self-recursive toExecute user dictionary lookups and exhaust validator memory, CPU, or stack. This issue is fixed in versions 1.30.2 and 1.31.23.14h CVE-2026-54080—

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———veraPDF PDF parser is a PDF parser for veraPDF. Prior to 1.30.2 and 1.31.23, veraPDF-parser contains a denial-of-service vulnerability in veraPDF-parser/src/main/java/org/verapdf/pd/font/cmap/CMapParser.java and veraPDF-parser/src/main/java/org/verapdf/parser/postscript/PSOperator.java, where a crafted Type 0 font /Encoding or /ToUnicode CMap stream can execute unbounded PostScript array allocation or a zero-increment for loop and exhaust validator memory or CPU. This issue is fixed in versions 1.30.2 and 1.31.23.14h CVE-2026-130566.5 MED

21.2%

——6Using expressions that generate large arrays it is possible to craft a query that creates very large intermediate objects in memory, causing the server to crash with OOM error.7d