(mozilla-projects-nss-nss-3-127-release-notes)=

# NSS 3.127 release notes

## [Introduction](#introduction)

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Network Security Services (NSS) 3.127 was released on *13 August 2026*.
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## [Distribution Information](#distribution_information)

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The HG tag is NSS_3_127_RTM. NSS 3.127 requires NSPR 4.39 or newer.

NSS 3.127 source distributions are available on ftp.mozilla.org for secure HTTPS download:

- Source tarballs:
  <https://ftp.mozilla.org/pub/mozilla.org/security/nss/releases/NSS_3_127_RTM/src/>

Other releases are available {ref}`mozilla_projects_nss_releases`.
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(changes-in-nss-3-127)=

## [Changes in NSS 3.127](#changes_in_nss_3.127)

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- Bug 2060720 - Round ECH ClientHelloInner padding up to a multiple of 32.
- Bug 2063071 - make selfserv listen on IPv6 wildcard on dual-stack hosts.
- Bug 2059176 - EC_DerivePublicKey() failure is not propagated in sftk_mkPrivKey().
- Bug 2052210 - Generate additional test message for Thunderbird (HTML with remote image).
- Bug 1869493 - Heap-buffer overflow in AES Keywrap.
- Bug 2054609 - remove cipher suite order exception from bug 946147.
- Bug 2061107 - restore pkcs12.h for source compatibility.
- Bug 2056291 - remove support for pre-v1.0 PKCS#12.
- Bug 2054719 - fix content type tag for CMS AuthEnvelopedData plaintext.
- Bug 2060118 - remove DH_GenParam support.
- Bug 2053831 - clang format.
- Bug 2054714 - avoid leaking stale ECH outer extensions across HRR.
- Bug 2053831 - Drop CKF_VERIFY flag from CKM_HKDF_DATA derivation in ECH GREASE.
- Bug 2053831 - Adjust PK11_Derive and TLS 1.3 derivation templates for CKM_HKDF_DATA and CKO_DATA compliance.
- Bug 2053831 - Use CKF_HKDF_SALT_DATA in tls13_HkdfExtract for CKO_DATA keys per PKCS#11 v3.2.
- Bug 2057184 - Enable -Wunused-but-set-variable/-global in werror.py.
- Bug 2056846 - Remove unused policy string callback to fix -Wunused-but-set-global.
- Bug 2052709 - Convert NSS 3.126 release notes to Markdown.
- Bug 2052709 - Rename doc/rst to doc/src and update references.
- Bug 2052709 - Apply markdownlint to the converted Markdown docs.
- Bug 2052709 - Fix Markdown documentation build warnings.
- Bug 2052709 - Convert documentation from reStructuredText to Markdown (automated).
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