EUVD-2026-111399

When coalescing adjacent text nodes in addText and fosterParent, appending to an existing TextNode's Data via string concatenation n.Data += text reallocated and copied the accumulated string on every token. Inputs containing many short text runs separated by ignored end tags such as "a" caused...

CVE-2026-78661

When coalescing adjacent text nodes in addText and fosterParent, appending to an existing TextNode's Data via string concatenation n.Data += text reallocated and copied the accumulated string on every token. Inputs containing many short text runs separated by ignored end tags such as "a" caused...

GO-2026-6860 Avoid quadratic complexity when coalescing text nodes in html in golang.org/x/net

When coalescing adjacent text nodes in addText and fosterParent, appending to an existing TextNode's Data via string concatenation n.Data += text reallocated and copied the accumulated string on every token. Inputs containing many short text runs separated by ignored end tags such as "a" caused...

Nodemailer: Quadratic (O(n^2)) SMTP client reply parsing lets a malicious server or MITM cause a pre-auth remote denial of service

Summary The SMTP client response parser reassembles multiline server replies by appending each continuation line onto a single response-queue entry and re-testing whether that entry is still a partial continuation reply on every line. The partial-response test runs str.slicestr.lastIndexOf'\n' + ...

Nodemailer: Quadratic (O(n^2)) DKIM header unfolding lets a large folded header cause remote denial of service during signing

Summary When nodemailer DKIM-signs an outbound message, its DKIM message parser unfolds RFC 5322 header continuation lines with a loop that concatenates each continuation line onto the preceding line and then re-tests the anchored regex /^ \t/ against the growing merged line on every iteration...

Amazon Linux 2023 : python3-jwcrypto (ALAS2023-2026-3158)

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-3158 advisory. A flaw was found in jwcrypto. The JWK.importkey function validates the keyops JWK member for duplicate values using an algorithm with On^2 time complexity, and the length of keyops is not bounded. A...

GHSA-RJ75-HQRM-R3GF PostCSS: Quadratic complexity in flat selector parsing allows CPU exhaustion

Impact . and are not word delimiters in the tokenizer, so a flat selector such as .a.a.a... reaches splitWord as a single word token carrying n class or id indexes. Three passes scanned those index arrays linearly for every index, making the parse On^2 in the number of indexes rather than in inpu...

PYSEC-2026-4053 hpack: Unbounded variable integer decoding can cause run-away computation on malformed input

Impact Users of the python-hyper/hpack library, most commonly used as downstream dependency of the python-hyper/h2 library an HTTP/2 client and server implementation. Unbounded variable integer decoding can cause run-away computation on malformed input leading to On^2 runtime, effectively blockin...

AlmaLinux 9.2 [TuxCare] Security Update: java-17-openjdk / java-17-openjdk-demo / etc Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2025:1753730595)

The AlmaLinux 9.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2025:1753730595 advisory. - Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition, product of Oracle Java SE componen...

AlmaLinux 9.2 [TuxCare] Security Update: harfbuzz / harfbuzz-devel / harfbuzz-icu (ALMALINUX9.2:CLSA-2025:1745945560)

The AlmaLinux 9.2 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.2:CLSA-2025:1745945560 advisory. - hb-ot-layout-gsubgpos.hh in HarfBuzz through 6.0.0 allows attackers to trigger On^2 growth via consecutive marks during the process of...

Rocky Linux 9 [CIQ] Security Update: harfbuzz / harfbuzz-debuginfo / harfbuzz-debugsource / etc (crlsa-2024_2410)

The Rocky Linux 9 host has packages installed that are affected by a vulnerability as referenced in the CIQ crlsa-20242410 advisory. harfbuzz: allows attackers to trigger On^2 growth via consecutive marks CVE-2023-25193 Tenable has extracted the preceding description block directly from the CIQ...

Rocky Linux 8 [CIQ] Security Update: harfbuzz / harfbuzz-debuginfo / harfbuzz-debugsource / etc (crlsa-2024_2980)

The Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CIQ crlsa-20242980 advisory. harfbuzz: allows attackers to trigger On^2 growth via consecutive marks CVE-2023-25193 Tenable has extracted the preceding description block directly from the CIQ...

Nodemailer addressparser: O(n^2) on comment-joined addresses enables a remote DoS (reachable via mailparser)

Summary nodemailer/lib/addressparser parses one shape of address in On^2 time. A single 640 KB address value blocks the Node.js event loop for roughly 7 seconds. And it is reachable without auth: mailparser feeds inbound email headers straight into this parser, so one crafted email is enough to...

NPM: Nodemailer addressparser: O(n^2) on comment-joined addresses enables a remote DoS (reachable via mailparser)

NPM: Nodemailer addressparser: On^2 on comment-joined addresses enables a remote DoS reachable via mailparser vulnerability discovered by ? in WordPress Npm nodemailer versions = 9.1.0, = 10.0.4...

CentOS Linux 7 [TuxCare] Security Update: harfbuzz / harfbuzz-devel / harfbuzz-icu (CENTOS7:CLSA-2024:1723795896)

The CentOS Linux 7 host has packages installed that are affected by a vulnerability as referenced in the TuxCare CENTOS7:CLSA-2024:1723795896 advisory. - hb-ot-layout-gsubgpos.hh in HarfBuzz through 6.0.0 allows attackers to trigger On^2 growth via consecutive marks during the process of looking...

CVE-2026-42772 Potential CPU DoS via O(n^2) Fragment Reassembly in QUIC

Issue summary: The QUIC stream reassembly algorithm performance deteriorates progressively as packets are arriving out of order. The worst case has a quadratic complexity proportional to the number of stream frames kept in the buffer for the received stream data. Impact summary: A remote QUIC pee...

CVE-2026-42772

A flaw in OpenSSL allows a remote attacker to cause a Denial of Service (DoS) by exploiting an inefficient QUIC stream reassembly algorithm. When packets arrive out of order, the software falls back to a head-to-tail linear search for fragments in a doubly-linked list. By manipulating sequence of...

CVE-2026-42772 Potential CPU DoS via O(n^2) Fragment Reassembly in QUIC

Issue summary: The QUIC stream reassembly algorithm performance deteriorates progressively as packets are arriving out of order. The worst case has a quadratic complexity proportional to the number of stream frames kept in the buffer for the received stream data. Impact summary: A remote QUIC pee...

CVE-2026-42772 Potential CPU DoS via O(n^2) Fragment Reassembly in QUIC

Issue summary: The QUIC stream reassembly algorithm performance deteriorates progressively as packets are arriving out of order. The worst case has a quadratic complexity proportional to the number of stream frames kept in the buffer for the received stream data. Impact summary: A remote QUIC pee...

Potential CPU DoS via O(n^2) Fragment Reassembly in QUIC

Issue summary: The QUIC stream reassembly algorithm performance deteriorates progressively as packets are arriving out of order. The worst case has a quadratic complexity proportional to the number of stream frames kept in the buffer for the received stream data. Impact summary: A remote QUIC pee...